JPH0825665B2 - Paper feeding device - Google Patents

Description

Description: [Industrial field of use] The present invention relates to a sheet feeding device used in an automatic teller machine or the like.

[Conventional technology]

In the conventional apparatus, as described in Japanese Patent Laid-Open No. 55-13482, the rotation speed or the start timing of the feeding roller that is intermittently driven is changed so that the distance can be increased when the distance is narrow.

[Problems to be solved by the invention]

The above-mentioned prior art only expands paper sheets with a sheet spacing of a certain value or less, and does not consider the feeding period to be constant. For this reason, when sheets stacked from such a device are stacked and stacked by an impeller or the like, the cycle is not constant, and therefore, the phase correction control of the impeller is performed for each sheet individually. There is a drawback that the stack performance cannot be sufficiently obtained without stacking.

An object of the present invention is to provide a paper sheet feeding device that solves the above-mentioned drawbacks by feeding paper sheets at a constant cycle or a cycle of an integral multiple thereof.

[Means for solving problems]

In a paper sheet feeding device that feeds the stacked paper sheets one by one by a feeding means that includes a roller that is driven to rotate, a detection means that detects an interval between the fed paper sheets,
Based on the output of the detection means, the paper feeding means has a control means for correcting the distance between the paper sheets so as to feed the paper sheet at a predetermined constant cycle. When the paper sheet of the paper sheet interval is detected, the feeding means is controlled to temporarily stop and re-drive the roller, and the feeding of the paper sheet having the above-mentioned predetermined paper sheet spacing is detected from the detected interval. It is fed out at a timing when it becomes a cycle of an integer multiple of 2 or more of the fixed cycle defined above.

According to a specific embodiment, the trailing edge of the first paper sheet (hereinafter referred to as the preceding paper sheet) fed from the feeding roller that rotates at a constant speed is detected by the paper sheet detection sensor provided at the roller outlet. The time between the detection of the leading edge of the second paper sheet (hereinafter referred to as the succeeding paper sheet) that is delivered from the next sheet is used to determine the size of the paper sheet interval. The speed is increased, and when the distance is smaller than the predetermined interval, the speed of the feeding roller is decreased to correct the interval to be constant. In this case, the interval correction is finished before the trailing end of the paper sheet being fed by the feeding roller passes through the feeding roller holding portion, and the feeding roller speed is returned to the original speed. Further, regarding the speed at the time of interval correction, the interval of a predetermined correction target range is divided into a plurality of parts, a control speed suitable for each division is assigned, and this is selected at the time of interval judgment. Therefore, the finer the division, the higher the correction accuracy.

Further, as described above, since it is necessary to complete the interval correction while feeding the paper sheet, when the interval exceeding a certain limit is detected, it is impossible to correct the interval to the predetermined one pitch. In this case, the feeding roller is stopped, the time from the time when the trailing edge of the preceding bill is detected is monitored, and the feeding roller is re-driven at a timing that is a cycle of an integral multiple of twice the predetermined pitch.

As described above, the paper sheet can be delivered at a constant cycle or a cycle of an integral multiple thereof.

[Action]

Since the paper can always be fed out at a predetermined fixed cycle or a cycle that is an integral multiple thereof, the paper fed out from such a paper feeding device is rarely collided at the time of stacking, and the impeller etc. Even when stacking, it is only necessary to consider adjusting the phases of the blades only for the first sheet, and it is possible to omit the phase control for the subsequent sheets or reduce the control scale.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a mechanism showing an embodiment. 1
Is a step motor for driving the feeding rollers 2a, 2b, 3
Is a pickup roller that works in conjunction with the feeding rollers 2a and 2b, and is pushed down by a spring 7 to facilitate feeding of paper sheets 8 such as banknotes. The outer peripheral portion 3b is made of, for example, a rubber material having a large friction coefficient, and is configured such that the paper leaf 8 is drawn out every time the outer peripheral portion 3b contacts the paper leaf 8. 4 is a roller in consideration of separating and feeding out the stacked sheets 8 one by one, and 5 is a push plate that supports the stacked sheets 8, and when the stacked sheets 8 are fed out, they are sequentially raised and fed out. It is considered that the pressing of the pickup roller 3 becomes constant while the surface height is kept constant. 6 is a paper sheet 8 fed from the feeding rollers 2a and 2b
Is a photo sensor that detects
It is arranged at a position close to the sandwiching point of 2a and 2b. When the step motor 1 is started and the feeding is started, the first paper sheet 8 is fed, and the step motor 1 is controlled to start up at a predetermined constant speed before the tip reaches the photo sensor 6. ing. When the feeding is continued at a constant speed thereafter, the interval or cycle of the fed paper 8 due to the degree of oldness / oldness of the paper 8, folding or rolling of the feed rollers 2a, 2b. The fact is that is not constant.

FIG. 2 is a schematic block diagram showing an embodiment of a control circuit section for controlling the drive of the step motor 1 so that the feeding interval or cycle of the paper sheet is constant or an integral multiple thereof. Reference numeral 11 is a sensor amplifier that amplifies the output of the photo sensor 6, 12 is a paper edge detection circuit that detects the edge of the paper from the output change of the sensor amplifier 11, and 13 is the same as 12 and detects the rear edge of the paper. Paper trailing edge detection circuit, 14 is a paper sheet interval detection unit that detects the feeding interval from the time difference from the detection of the trailing edge of the preceding paper sheet to the detection of the leading edge of the next paper sheet, and 15 is a normal cycle from the detection interval. Of the speed control table to select the speed control table, which will be described later, to select and control the speed control for the interval or the interval of the integer multiple period, 16 is a storage unit 16a of the control table, and a control unit. A control unit composed of a pulse control unit 16b for generating a drive control pulse of the step motor 1 from a table or the like, and 17 is provided when the interval detected by the interval detection unit 14 is equal to or greater than the limit of correction to a predetermined one-cycle interval. , Step motor 1 Then, the restart timing calculation unit for restarting so that it becomes an integral multiple cycle of 2 times or more, 18 determines the feeding cycle from the time difference from the trailing edge detection of the preceding sheet to the trailing edge detection of the succeeding sheet. Detecting cycle detection unit, 19 is a cycle detection unit due to overlapping and tearing of paper sheets
When the cycle abnormality is detected in 18, the trailing edge detection time of the paper sheet that detects the cycle abnormality is set so that the next sheet to be fed can be fed in an integer multiple cycle with the normally fed sheet before the cycle abnormality. A sheet trailing edge detection point correction unit for correcting the time corresponding to the regular cycle or the integral multiple cycle, and 20 is the step motor 1
Is a step motor drive circuit for driving the.

The operation of the embodiment of the present invention will be described below with reference to FIGS.

Interval detection is performed from the time from the trailing edge detection circuit 13 detecting the trailing edge of the preceding sheet until the leading edge detection circuit 12 detects the leading edge of the following sheet and the speed (constant speed value) of the step motor 1. The interval is detected by the section 14, and if the interval is normal, the step motor 1 is continuously driven at a constant speed. If the interval is small,
The step motor 1 is switched to the low speed control and to the high speed control when the interval is widened so that the table selection unit 15 stores the speed control table so that the paper sheet being fed out with the preceding paper sheet as a reference has a predetermined interval. The step motor 1 is controlled by selecting the table of the unit 16a and performing pulse generation control corresponding to the table value by the pulse control unit 16b. In this case, the speed control table is selected by dividing a predetermined interval correction target range into a plurality of intervals and selecting a speed control table corresponding to each interval of each division. Therefore, the number of tables increases as the division is subdivided, but the interval correction accuracy improves. Further, the roughness of division is accumulated as an error as it is, but if it is desired to eliminate this accumulation, the cycle detection unit 18 is determined by the time from the trailing edge detection of the preceding sheet to the trailing edge detection of the sheet under control. Cycle detection with
The trailing edge detection point correction unit 19 corrects the difference from the regular cycle, and the regular cycle time point is assumed to be the trailing edge detection point to control the next sheet. It should be noted that when the amount of the period deviation is large, it is possible that the sheets are heavier and the sheets are torn, which will be described later.

The interval correction control starts from the time when the front end of the paper sheet is detected by the photo sensor 6 and the front end detection circuit 12, ends until the rear end passes through the nipping point of the feeding roller 2, and Since the time from the detection of the trailing edge to the end of the interval correction control of the paper sheet must be controlled so that the specified feeding cycle matches, naturally, when feeding is performed at an interval exceeding a certain limit. Is
The correction control to the defined one pitch interval becomes impossible. In this case, when it is recognized that the interval is equal to or larger than a predetermined limit at the time when the leading edge of the sheet is detected, the supporting step motor 1 is stopped here, and the restart timing calculation unit 17 causes Timing is calculated from the passage of time after the edge is detected to be an interval that is an integer multiple of at least twice the cycle of one pitch, and the step motor 1 is controlled to start up to a constant speed at that timing. .
Therefore, when the leading edge of the paper sheet is detected at an interval equal to or greater than a certain limit, the feeding cycle is corrected so that the feeding cycle becomes an integral multiple of the fixed pitch.

The interval may be determined by detecting the leading edges of the preceding and subsequent sheets, but it is necessary to correct the speed variation for the interval correction every time.

As described above, according to the present invention, it is possible to feed the paper sheet with a certain feeding cycle or an integral multiple thereof.

The above is based on the assumption that the width of the paper in the feeding direction is constant, but in a bill handling device, etc., there are sticky substances on the bills, and the bills are overlapped and fed, tilted, or folded in half. There is a possibility that it may be broken or broken.

The case where these abnormal paper sheets are fed out will be described below.

The period from the time when the trailing edge of the preceding sheet is detected by the photo sensor 6 and the trailing edge detection circuit 13 to the time when the trailing edge detection is completed after the interval correction control of the succeeding sheet is detected, If the time is longer than the specified time, it is considered as an overlap or an inclination, and in this case, the time point after the trailing edge of the paper sheet is detected and an integer multiple cycle has elapsed after the trailing edge of the preceding paper sheet is detected, The sheet trailing edge detection point correction unit 19 corrects the trailing edge detection point to be virtual, and the next sheet is controlled based on this correction. Therefore, the paper sheet next to the overlapping or tilting paper sheet is fed out at an integral multiple cycle with the normal width paper sheet before the overlapping or tilting paper sheet. Further, if the time from the detection of the trailing edge of the preceding sheet by the photo sensor 6 and the trailing edge detection circuit 13 to the detection of the trailing edge of the succeeding sheet is shorter than the predetermined time, it is regarded as folding or tearing, In this case, the sheet spacing correction control is ended in the same manner as the normal paper sheet, but the trailing edge detection point is virtualized at the time when one cycle elapses from the trailing edge detection of the preceding sheet. The sheet is corrected by the trailing edge detection point correction unit 19, and the next sheet is controlled based on this correction. Therefore, the paper sheet next to the folded or torn paper sheet is fed out at a double cycle with the normal paper sheet before the folded or torn paper sheet.

As described above, according to the present invention, the overlap or the inclination on the way,
Alternatively, even if a paper sheet such as a fold or a tear is delivered, the next paper sheet can be delivered in an integral multiple cycle with the previous normal paper sheet.

In the description of the operation of the above embodiment, the interval or period correction reference is set at the time of detecting the trailing edge of the preceding sheet, and the correction control is performed by detecting the size of the interval with the succeeding sheet. As a method, a pulse having a constant cycle that coincides with the feeding cycle defined by the control unit is generated, and the amount of time difference between the pulse and the time when the leading edge of the paper sheet is detected is replaced with the above-described interval, and the step motor 1 The speed control may be performed in the same manner as in the above embodiment. Of course, in this case, the sheet trailing edge detection circuit 13. The cycle detector 18, the sheet trailing edge detection point correction unit 19 may be omitted.

〔The invention's effect〕

According to the present invention, the following effects can be obtained by feeding the paper sheet at a constant cycle or a cycle of an integral multiple thereof.

1) Since the paper sheets can be drawn out without approaching each other, when stacking the drawn out banknotes like an automatic teller machine, the banknotes may collide with each other to cause a stacking defect, but this is reduced. can do.

2) Paper sheets are delivered at a constant cycle or a cycle that is an integral multiple of that, so even when stacking them with an impeller, etc.
It is only necessary to consider adjusting the phases of the blades only for the first sheet, and the phase control for the subsequent sheets can be omitted or the control scale can be reduced.

3) In an automatic teller machine or the like, the interval check is performed after the banknotes are paid out, and if the interval is narrower than the predetermined interval, it is treated as an abnormal banknote. Since the correction is performed, it is possible to reduce the occurrence of abnormal bill handling due to an abnormal interval, and thus it is possible to improve the usage efficiency of bills.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a mechanism in one embodiment of the present invention,
FIG. 2 is a schematic block diagram of a step motor drive controller in one embodiment of the present invention. 1 ... Step motor, 2a, 2b ... Feeding roller, 3 ... Pickup roller, 6 ... Photo sensor, 11 ... Sensor amplifier, 12 ... Paper edge detection circuit, 13 ... Paper rear edge detection circuit , 15 …… table selection part, 16 …… control part, 20 …… step motor drive circuit.

Claims (1)

[Claims] 1. A sheet feeding device for feeding sheet-by-layer sheets one by one by a feeding means including a roller which is driven to rotate, and a detecting means for detecting an interval between the fed sheets and an output of the detecting means. According to the above, there is a control means for controlling the feeding means so as to feed the paper sheet at a predetermined fixed cycle by correcting the interval between the paper sheets. When the paper sheet of the paper sheet interval is detected, the feeding means is controlled to temporarily stop and re-drive the roller, and the feeding of the paper sheet having the paper sheet spacing equal to or larger than the predetermined distance is detected from the detected distance. A paper sheet feeding device, which feeds at a timing of a cycle that is an integer multiple of 2 or more of the fixed cycle defined above.